抄録
Emission characteristics of hydrazones (Ia-g) and cyclization products (IIa-c, IIIa-c, IVa, b) derived from the reactions of 2-amino-3-hydrazino-(AH) and 2, 3-diaminoisocarbostyril (DA) with carbonyl compounds were examined. The significant enhancement in the phosphorescence was caused by the formation of hydrazones of AH. The large Stokes shifts for Ia-g observed in various solvents were explained in terms of the exciplex formation of charge transfer and hydrogen bonding types between a solute and a solvent molecule in an singlet excited state. The intense fluorescence for IIa-c and IIIa-c was shown in ethanol but no emission for IVa, b. It was suggested by the comparison of the molecular structures between IIa-c-IIIa-c and IVa, b that the bond chacacter of N1-atom plays an important role for the emission of cyclization products.
